Ignition-dynamo.



C. T. MASON.

IGNITION DYNAMO.

APPLICATION FILED IULY26. 1913.

Paten'ted May 1915.

W j luon b42014 I I what/3w,

siding at Sumter,

CHARLES THOMAS MASON,

onnror'.

OF SUMTER, SOUTH CAROLINA, ASSIGNOR TO SUMTEB ELECTRICAL COMPANY, A CORPORATION OF SOUTH CAROLINA.

IGNITION-DYNAMO.

To all whom it may concern:

Be it known that I, CHARLES -THOMAS MASON, a citizen of the United States, rep in the county of Sumter and State of South Carolina, have invented. certain'new and useful Improvements in Ignition-Dynamos, of which is a "specification, the accompanying This invention reference being had to drawing.

relates to ignition dynato those of the magneto type, and the object is to provide a machine adapted to produce two simultaneous currents at the same instant.

Another object of the invention is to generate each current in a separate winding, but to dispose all included in the same magnetic circuit.

Further objects of the invention are, to employ the same interrupter contacts for both windings, to produce a simplified structure, to increase the efiiciency of the generation and to eliminate the use of special spark plugs.

My invention isillustrated in the accompanying drawing, gram showing the invention applied to an ignition system with two spark devices such as plugs. a

Any form of magneto having a suitable field structure carrying generating windings may beemployed. Such a machine is disclosed in my pending application Serial No. 732681, filed Nov. 21,1912.

The details of construction of the magneto are immaterial except the disposition of the windings on the field structure, hence I shall describe herein only sufficient to illustrate how my invention is embodied and practised.

It is well known that the time required for the propagation of the flame from a single spark throughout the inder of an internal combustion engine, has been such as to'make it necessary to time the magneto, so that the spark would be produced before the piston reaches dead center. In some high speed engines the ignition is advanced as much as degrees. This advance is undesirable for reasons well known to those skilled in theart, and many attempts have been made to secure a more rapid propagation of the flame area whereby the amount of advance could be reduced.

It is obvious that if a large single spark Specification of Letters Patent.

Application filed July 26, 1913.

' propagated throughout the following windings so they well. be

which is a simplified diasecondary,

mixture inthe cyl- Patented May 25, 1915. Serial No. 781,415.

could be produced, the flame area would be the mixture much faster, but asthe size of asingle spark is limited by commercial considerations such I as the size of the magneto, etc., it is impossible to materially increase its area. It is also obvious that duced at separate points in the cylinder. at the same instant, that the flame area will be more rapidly increased than if a single spark is used. Many attempts have been made to employ two sparks. For example it has been'objectionable to use twospar k plugs in series butthe attempts so far as I know have been unsuccessful as it re quires one of the two points insulated from the engine cylinder, instead of the usual single insulated point. A very gaps.- Anotherplan is to arrange the secondary winding on the magneto so that both ends of same are brought out to a double distributer but this is also objectionable as requiring a high p0- tential, and because it makes the magneto complicated in construction, as it is particularly difiicult to insulate both ends of the as distinguished from the usual grounding one end on the magneto. Other attempts conpractice. of frame of the template the use of two armatures with separate interrupters, or other complicated devices, none of which have proven commercially successful.

To obtain the advantages of the double spark ignition without necessitating the use of special spark plugs or other objectionable features, I provide the field structure 1 of the type of'magneto disclosed in-my pending application hereinbefore' mentioned, with two separate primary windings 2 and 3m series, one end of 3 being grounded as shown at 4 and the remaining end of 2 connected to the interrupter point 5. The movable -interrupter point 6 isgrounded, and operated by the cam 7 which is mounted on the shaft 8 carrying the rotors'9 and 10 by means of which magnetic impulses of alternately'opposite polarity are transferred to the pole shoes 11 and 12 of the field structure. The interrupter contacts are bridged by the usual condenser 13.

Each primary winding is provided with a secondary winding 14- and 15. One end of plugs to be provided with high potential is also neces-' sary to ump two spark if two sparks are prochanges in matters ef detail ignition s sin-11 l L shown at 16 and 17. The remainlng; ends connected to the insulated terminals 18 and '19 of ordinary spark pings, it being underthe primary winding "wh' ailects the secondary windings is an, if) nd produces simultaneous spans at the spam plugs. I

i N ,e x i. 11 7 i. w t in the case or minis-cyli der engines, a suitable distrlbut'er 1s lnser'ec in the circuits between the ma 'neto and soarlr nin s. As b: I J l 23 such an arrangement is well Known, i do not show it. I

if for any reason additional snnnltancons sparks are necessary, additional. windings may be placed on the field structure in any suitable manner. The various windings y be snncrnnposed on each other, or separate secondary windings over a single properly proportioned primary winding may be employed; but in any case the breali down or short circuiting of will not affect the remaining secondary winding or windings and cor eqnently one or more spark. plugs will always be opera tire. The potential required only the normal potential necessary to jump pl i hile l have described a specific stern and arrangement of sparlr. plugs, it'is to he understood that the machine embodying my invention is not limited thereto but may be employ in other systerns and for other pur oses can those hereinspecifically disclosed.

' it should be additionally noted may bemade without departing from the spirit of the invention, and l contemplate and intend to cover all such nonessential changes and modifications as fall fairly within the scope of the appended claims.

Having thus described my invention what I claim and desire to secure'by Letters Pattherein, a primary winding associated with said secondary field, and a plurality of secondary windings associated with primary winding and having snltable terminals tor connection-to translating devices.

a dynamo electric machine, primary magnetic neld, a normally fixed s ter synclmononsly any secondary winding th at I ing connected sci tween'the fields for producing varyin' mag netonooti e forces in said secondary eld, a

primary winding associated. with said secondary field, and a plurality of windings associated with said primary winding-havingsnitable terminals for connection to trans-- lating devices, together with an interrupter included in circuit with the primary winding, and means for actuating said interrupith the variations in. inagn etoinotire force of the secondary field o. in a dynamo electric machine, a Xilb tnre ad ustable with respect to the primary for purposes oittiming, movable means criodically varying theilnx from the primary field through the secondary field, and plurality ofgrene'rating windings can ried on said secondary field structure, and all adapted thereby to. he simultaneously eX- iting; field, a secondary field str ocposed to the same magnetic flux variations, and to be simultaneously timed by the 'adinstnient of one field structure with respect to the other.

"narno' electric machine, means fo roll s primary magnetic excitation, a 007'] f'n p \lrl ct -1 l I n dina neoic new, s weenie lnec anica y a justable for purposes of timing, means for,

carrying: magnetic flux from the primary exciting means to said magnetic field. and ,r varying the same therethrongh periodiity of generating windings said magnetic trnctnre and I 7 .r mounted on ninltoneonsly adjnstaole therewith for syn-.

chronJns sing, and interrupting means in. synchronism with the in variath electrical circuit- 1 he generating windings conti interrnptin means.

in a furnishing prime y lna gnetic gnetic field structure mechanically nstable for purposes of timing", means,

olled by cairyiiiginagnetic fins: from the primary citing means to said magnetic field and for varying the same therethrough periodically, a plurality of generating windings mounted on aid magnetic structure and sininltane onsly adjustable therewith for synchronous timing, and interrupting means operated in synchronism with the flux variations, with electrical circuit connections irom the gen erating windings conlrolle l rnpting means, said gnetic field struc' ture for adjustment therewith, whereby the point of the curve of E. M. F. atwhich interruption takes place, is maintainedconstant for all the generating windings, in all adjnsted positions, and the current discharges delivered the is always of the same predetcrinineo a chronism. y

6, ln a dynamo electric machine for igni-= connections "by said inter ng means hcdynamo electric machine, means excitation,

nd perfect syn- 7 primary winding.-

In a dynamo electric machine for igniaien systems, a relatively fixed magnetic structure, a relatively adjustable gen erating coil structure of magnetic material, movable flux carrier driven to shift the magnetic flux from the magnetic field alternately in opposite. directions through the generating coil structure, a primary winding on said coil structure, a plurality of secondary windings associated with said primary winding, and an interrupter mechanically associated and operated in synchronous relation with said movable flux carrier, and electrically connected in circuit with said primary winding, said interrupterbeing also mechanically connected with the generating coil structure and movable o therewith for timing purposes.

8. A dynamo electric machine for ignition systems comprising a fined magnetic magnetic field, a rotor having a pair of ernianentiy oppositely polarized elements each connected to and constituting a mov- Witnesses:

able' extension of one pole piece of the fixed magnetic field, said coming into alternate proximity with opposite poles'of the coil shifting the magnetic flux from the primary field through said secondary poles alten-lately in opposite directions, means for structure or secondaryfield angula-rly about'the axis 01; said rotor adjusting the coil for timing purposes, an interrupter mechanlcally connected to said COll structure and adjustable therewith for timing, operating means for said interrupter mechanically connected to the rotor shaft and driving means, a primary winding on the coil structure or secondary field, in circuitwith said interrupter, and a plurality of secondary windings associated with said primary winding, having independent circuit connections to ignition devices, whereby abs0- lutely simultaneous and synchronous sparks may be obtained 9. A dynamo electric machine for ignition systems comprising a magnetic field, a rotor excited therefrom, and a normally fixed generating coil having a plurality of separate spark producing windings, means for producing simultaneous adjustfor timing purposes.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

CHARLES THOMAS MASON.

F. C. MANNING, 1 H. R. VAN DEVENTER.

elements in rotating 40 structure and therebyof uniform intensity and 60 'volumethroughout the entire range of timment between all thewindings and the rotor 

